Split sleeve latch



Dec. 12, 1961 N. E. DOVEY 3,012,419

SPLIT SLEEVE LATCH Filed Nov. 3, 1960 INVENTOR T .E. 525-4- NORMAN E. DOVEY United States Patent 3,012,419 SPLIT SLEEVE LATCH Norman E. Dovey, 1922 Indiana Ave., Anderson, Ind. Filed Nov. 3, 1960, Ser. No. 67,055 9 Claims. (Cl. 64-6) This invention relates to a split sleeve latch and more particularly to an opposed movement latch to positively secure the two halves of a split ring around a driven shaft.

It has been common practive in cutting blanks from cardboard or analogous material to have the rotating knife seat against a rotating metal or rubber surfaced anvil composed of a split sleeve positioned on a rotating shaft in a printer slotter machine. The object of this invention is a latch mechanism that holds the two halves of the split sleeve anvil securely onto the printer slotter shaft. A further object of this invention is the use of a latch comprising two latching elements that operate in an opposite direction to easily secure the split sleeve anvil together and to conveniently allow separation of the anvil sections. One of the latch mechanisms produced according to this invention is used at each of the two joints of the split sleeve.

A further object of this invention is the use of a completely internal latch for securing the two sections of a split sleeve about a shaft by a latching mechanism that not only results in a substantial reduction of weight and cost of the sleeve assembly, but also allows a number of such assemblies to abut one another on a mounting shaft to form a continuous cutting surface that is not significantly broken at the junction between adjacent sleeves.

Still other objects and advantages of the invention will become apparent to a person familiar with the art to which the invention relates from the following description taken in connection with the accompanying drawings in which there is illustrated a preferred embodiment of the invention and in which:

FIGURE 1 is a plan view of two anvils mounted on a shaft;

FIGURE 2 is a partial cross section of the end view of the invention;

FIGURE 3 is a partial cross section of the assembled sleeve with the latch in the locked position; and

FIGURE 4 is a partial cross section of the assembled sleeve with the latch in the unlocked position.

Referring to the drawing, FIGURE 1 shows two split sleeve arbors 4 as they are assembled on shaft 2 which in this embodiment of the invention is the arbor shaft of a printer slot-ter machine used in cutting blanks from cardboard or like material at high speeds. It is noted that the arbors having the improved latch means may be placed side by side on the shaft 2. This feature is advantageous because the cutting surface may be increased by placing a number of the arbors together on the shaft. A split sleeve having an extended or non concealed latch mechanism could not be abutted to provide this continuous cutting surface.

In FIGURE 2 external surface of the sleeve 4 is covered with a hard rubber or like material to provide a cutting surface against which rotating knives of the printer slotter bear to sever whatever material is being processed. Generally, rectangular slots 34 and 36 are provided in sleeve half frames 6 and 8 respectively and these slots are positioned so that when the sleeve halves are brought together they form a continuous cavity 37. To mount the sleeve non rotatably on the shaft 2, a number of spaced keyways 12 are provided on the internal surface of the anvil. The keyways allow angular positioning of the anvil so that the knives will not contact the Patented Dec. 12, 1961 same portion of the cutting surface in successive installations. This allows even wear of the cutting surface. Relative rotational speed of the cutter shaft with respect to the anvil shaft 2 determines the optimum number of keyways 12. Anvil 4 is joined by two identical latching arrangements; one is seen in the cross sectional portion of FIGURE 2 and the other is at the opposite side and is represented by dotted lines.

In FIGURE 3 the two halves of the anvil are secured together. The latching mechanism at each side of the anvil 2 comprise a pair of clamping saddles 16 and 18 that have extending arms 38 provided with inclined camming surfaces facing inwardly. An operating bolt 14 has oppositely threaded portions that extend through apertures in saddles 16 and 18 so that rotation of the bolt causes the saddles to move in opposite directions. The two camming surfaces of the arms 38 on saddle 16 contact pins 20 and 22 respectively while in a like manner the two camming surfaces of the arms 38 on saddle 18 contact pins 24 and 26 respectively, so that the two halves of the arbor are cammed together. The pins 20, 22, 24, and 26 extend through cavity 37 and are received in the frame members through appropriate apertures.

In FIGURE 4 the anvil is disclosed with the latch mechanism in its unlocked position. The bolt 14 is rotated in a direction opposite to that required to lock the anvils and the saddles 16 and 18 are driven inwardly to disengage the camming surfaces of arms 38 from the pins 20, 22, 24, and 26. With the saddles in their disengaged position, it is possible to separate the halves of the anvil. To prevent the assembly of bolt 14 and saddles 16 and 18 from falling loosely from frame 8, a keeper 32 is provided in this frame. The recessed portions 28 and 30 of saddles 16 and 18 respectively engage the keeper and hold the beforementioned assembly within the slot 35 of frame 8.

To assemble the sleeve over a shaft the two halves are brought together around the shaft and the bolt 14 is rotated to move saddles 16 and 18 apart. This causes the saddles to engage pins 20, 22, 24, and 26 to securely fasten the sleeve into a unit and thereby hold it on the shaft. By reversing the rotation of bolt 14, the saddles are moved together and the sleeve may be separated and removed from the shaft.

Although the invention is described in the preferred embodiment of a cutting anvil for a printer slotter machine, the invention may be used in a variety of applications and it is not intended to limit this invention to the particular environment discussed.

What is claimed:

1. A latch adapted to securely join a first and a second frame member of a split sleeve, each of said frame members having a slot at both extremities, recessed portions formed by slots in adjacent ends of said first and second frame members when said members are brought together, a pair of spaced pins located in each slot, said recessed portion receiving two saddle members having cammingsurfaces thereon and having threaded apertures therethrough, and a bolt having oppositely threaded end portions, one of said threaded end portions engaging the threaded aperture of one saddle and the second threaded end portion engaging the other threaded aperture of the second saddle whereby said saddles are moved apart when said bolt is rotated so that the camming surfaces ofsaid saddles engage the pins in said slots to thereby secure said first and said second frame members together.

2. A latch adapted to securely join a first and a second frame member of a split sleeve having a latching means at each junction between said frame members to thereby securely latch said frame members together, each of said latching means comprising a pair of pins secured to each of said frame members, two camming members, and actuating means to move said camming members apart to thereby engage each of said camming members withone pin on they first 'frame member and one pin on the second frame member to securely join said frame members and a means for holding said camming members and said actuating means onto one of said frame members when the latching means is in the unlatched position.

3. A latch as defined in claim 2 wherein said means to move said camming members comprises a bolt having oppositely threaded ends that coact with threaded apercure in said camming members.

4. A latch as defined in claim 2 wherein said means for holding said camming members and said means to move said camming members comprises a pin engageable by recessed portions on said camming members when said camming members are in the unlatched position.

5. A latch adapted to securely join a first and a second frame member of a split sleeve, each of said frame members having a slot at both extremities, recessed portions formed by slots in adjacent ends of said first and second frame members when said members are brought together, a pair of spaced pins located in each slot, each of said recessed portions receiving two saddle members having camming surfaces thereon and having threaded apertures therethrough, a bolt having oppositely threaded end portions, one of said threaded end portions engaging the threaded aperture of one saddle and the second threaded end portion engaging the threaded aperture of the second saddle whereby said saddles are moved apart when said bolt is rotated so that the camming surfaces of said saddles engage the pins in said slots to thereby secure said first and said second frame members together, and means afiixed to one of said frame members to present removal of the saddle members and bolt when said latch is in its unlatched position.

6. A latch as defined in claim 5 wherein said means to prevent removal of the saddle members and bolt comprises a pin engageable by recessed portions on said saddle members when said saddle members are in the unlatched position.

7. A latch adapted to secure a first and a second frame member comprising a pair of pins affixed to each frame member, a pair of saddle members each having camming surfaces thereon, threaded apertures in each of said saddle members, a bolt having a first threaded portion adjacent one end for engagement with the threaded aperture of one saddle member and a second threaded portion adjacent the opposite end of said bolt for engagement with the threaded aperture of the other saddle member, said threaded portions of said bolt being oppositely threaded so that rotation of said bolt causes the saddle members to move apart thereby engaging the camming surfaces of the saddle members with a pin on each of the frame members to latch said frame members together, a recessed portion on each of said saddle members, and a pin on said second frame member whereby said pin engages said recessed portion on each saddle member to prevent removal of said saddle members when said latch is in the unlatched position.

8. A latch adapted to join the first and second frame member of a cutting anvil for a printer slotter machine comprising a pair of pins afiixed to each frame member, a pair of saddle members each having outwardly extending arms with camming surfaces on the inward portion of said arms, threaded apertures in each of said saddle members, a bolt having a first threaded portion adjacent one end for engagement with the threaded aperture of one saddle member and a second threaded portion adjacent the opposite end of said bolt for engagement with the theaded aperture of the other saddle member, said 7 threaded portions of said bolt being oppositely threaded so that rotation of said bolt causes the saddle members to move apart thereby engaging one'camming surface of one saddle member with a pin in the first frame memher and a second camming surface of said saddle with a pin in the second frame member and engaging one camming surface of the second saddle member with a pin in the first frame member and a second camming surface of said saddle member with a pin in the second frame member to latch said frame members together, a recessed portion on each of said saddle members, and a pin on said second frame member whereby said pin engages said recessed portion on each saddle member to prevent removal of said saddle members when said latch is in the unlatched position. 7 V

9. A latch adapted to securely join a first and a second frame member of a split sleeve, each of said frame members having a slot at both extremities, recessed portions formed by slots in adjacent ends of said first and secondframe members when said members are brought together, a pair of spaced lugs located in each slot, said recessed portion receiving two saddle members having camming surfaces thereon and having threaded apertures therethrough, and a bolt having oppositely threaded end portions, one of said threaded end portions engaging the threaded aperture of one saddle and the second threaded end portion engaging the threaded aperture of the second saddle whereby said saddles are moved in opposite directions when said bolt is rotated so that the camming surfaces of said saddles engage the lugs in said slot to thereby secure said first and said second frame members together.

References Cited in the file of this patent UNITED STATES PATENTS 692,945 Boyce Feb. 25, 1902 738,765 Boyce Sept; 15, 1903 937,111 Sparr Oct. 19, 1909 1,646,692 Hamilton Oct. 25, 1927 

